R如何拆分字符串

Question

我有一个像

这样的字符串

a <- "Hi. I m cool, but I need help!"

作为我想要的输出

"hi" "." "I" "m" "cool" "," "but" "I" "need" "help" "!"

此外，我不想使用额外的包。

Answer 1

我们可以使用strsplit

a1 <- strsplit(a, '\\s|(?=[!,.])\\s*', perl = TRUE)[[1]]
a1[nzchar(a1)]
#[1] "Hi"   "."    "I"    "m"    "cool" ","    "but"  "I"    "need" "help" "!"